Folder for blindstitch sewing machines



J. GALKIN FOLDER FOR unvsrncwsawmc manning Filed Nov. 28, 1949 July 28,1953

5 Sheets-Sheet 1 JOSEPH GALKIN INVENTOR ATTORNEY July 28, 1953 J. GALKIN FOLDER FOR BLINDSTITCH SEWING MACHINES 3 Sheets-Sheet 2 Filed NOV. 28, 1949 &

JOSEPH GALKIN mvsu'ron BM M ATTORNEY 1 1953 .J. ALKlN 2546,759

FOLDER FOR Bpmos rrrcu SEWING Filed Nov. 28, 1949 5'; {Sheets-Sheet :5

JOSEPH sALkm' F [G 8 I INVENTOR ATTORNEY Patented July 28, 1953 (UNITED STATES PATENT OFFICE- FOLDER FOR BLINDSTITCH SEWING MACHINES Joseph Galkin, New York, N. Y.

Application November 28, 1949, Serial No. 129,749

2 Claims. (Cl. 112-147) 1 1 This invention relates to improvements in folders for belt loops made on blindstitch sewing machines. An object of this invention is to provide a folder which will accurately fold a strip of material so that the folded edges thereof are brought together on the upper side of the strip and both edges of the strip concealed inside the belt loop, and a line of blindstitch stitching passed through the folded edges, and. partly through the face portion of the belt loop.

Another object of this invention is to provide a folder having two inwardly curved side edges for equally folding both side edges of the strip above the strip and toward each other in abutting relation, and to provide outwardly curved extensions at the outlet end of the folder for folding the fabric strip outwardly into concealment in the belt loop, and to provide means for pivotally mounting the folder to cause the rear portion of the folder to follow the upward movements of the node former of the blindstitch sewing machine. l

. Another object of this invention is to provide spring means to cause the folder to move downwardly after it is raised by the node former and released.

With the above and other objects in view, the invention will be hereinafter more particularly described, and the combination and arrangement of parts will be shown in the accompanying drawings and pointed out in the claims which form part of this specification.

Reference will now be had to the drawings, wherein like numerals of reference designate corresponding parts throughout the several views, in which:

Figure 1 is a top plan view of the folder, pivotally mounted on a work table of a blindstitch sewing machine.

Figure 2 is a side view of the pivotally mounted folder and of a fragmentary portion of the sewing machine shown in Figure 1 and in which the folder is installed.

Figure 3 is a side view of thepivotally mounted folder and folder support.

Figure 4 is'a cross-sectional view taken on line 4-4 in Figure 1. 2

Figure 5 is a front view of the assembled folder and folder support.

Figure 6 is a rear view of the folder and folder support.

Figure 7 is a central cross-sectional view. of a modified spring-mounted folder.

Figure8 is a top plan view of mechanism for feeding a tape into the belt loops.

In the illustrated embodiment of the invention, the numeral It) indicates a folder for belt loops made on a blindstitch sewing machine H. The machine ll comprises a work table [2 formingpart of a bracket I 3 which is secured to the frame 14 of the sewing machine. The bracket com prises a support 15 having a pivot I6 on which the forward end portion of the folder In is pivotally mounted to permit upward and downward movement of the rear end of the folder. The support i5 is suitably fixed tothe bracket I3 by screws l3. s

A coil spring I! has one end fixed to a lug I8 at the rear end of the folder l0 and has its other end fixed to a stud is threaded in the support [5.

The spring I! functions as the sole means to bring the outlet end of the folder downwardly in direction of a node former or oscillatory finger 29, well known in the art of blindstitch sewing machines.

Journaled in a forwardly extending horizontal arm 2| of the sewing machine H is an oscillatory needle shaft 22. The needle shaft 22 is oscillated from the main shaft of an eccentric on the main shaft which drives a vibratory connection on the needle shaft.

As shown in Figure 2, the shaft 22 extends forwardly beyond the free end of the arm 2! Fixed to theprojecting end of the shaft 22 is a needle arm 23 to which a curved needle 24 is attached.

The sewing machine to whichthe folder I0 is applied is more fully shown in my patent application, Serial No. 100,554, filed June 22, 1949.

The invention is particularly directed to a pivotally mounted folder H] forming part of a combination of mechanisms operating upon sections or scraps of cloth for fully automatically forming in a single operation blindstitched belt loops, each having edge portions which are concealed internally of the belt loop to prevent ravelling of the edges of the cloth. 7 r The side walls 25, 25 of the folder [0 are inwardly curved. The folder gradually tapers from the receiving end 26 towards the delivery end 21 of the folder, and so that as the strip which is folded leaves the delivery end, the strip is folded equally upwardly upon itself at both sides of the belt loop. I

As shown in Figures 1, 4 and 6, it will be seen that the bottom wall of the folder lies fiat between the curved side walls 25, 25 and that a clear passage is provided through the folder from the inlet end to the outlet end thereof.

The outlet end 2'! of the folder I0 terminates directly in front of the needle 24. As shown in Figures 5 and 6, the side walls 25 have outwardly is curved extensions 29 at the outlet end of the folder. The extensions 29 fold the belt loop fabric outwardly into concealment in the belt loop.

As shown in Figures 4 and 6, the lower face of the rear end portions 21 of the folder l6 has an opening centrally thereof. The opening 30 is of a size permitting the node former 2G to enter directly into the rear end portion 21 of the folder. The downward movement of the folder I!) caused by the spring H is arrested by the upper end portion of a slide plate 32 having a slot 33 through which the stud l9 passes into threaded engagement with the support [5.

A threaded nut 3 on the stud la'permits the slide plate 32 to be adjusted in vertically supported relation. This arrangementpermitsthe.

adjustment of the folder to be made such that the position of the folded fabric in the folder in relation to the needle 24 causes the needle to only partly penetrate the top surface of the folded belt loop.

As shown in Figures 4 and 5, the base plate 35 of the folder H] has a central rib 35 having an aperture 3'? through which the pivot pin l5 passes. The pin It is held in a block 38 which is slidably mounted in a guideway 39 in the folder support I5. A look screw 49 threaded in the folder support l5 serves for clamping the block 38 in the support 15 so as to bring the delivery end 21 of the folder close to theneedle 24.

Figure 'I is a central cross-sectional view of a modified spring-mounted folder comprising a folder support having a block 18 slidably mounted in the support it, similar to the slidable block 38 shown in Figures 4 and 5.

The block 58 is secured in adjusted relation in the support "at by a screw M. A right-angular leaf spring 49 is secured to the block 48 by a screw 50. The folder base plate 5| of the modified folder 45 is secured to the leaf spring 59 by a rivet 52.

The leaf spring as is formed so as to' urge the folder base plate 5! in a downward direction. A slide plate 53-has a slot 5% through which a bolt 54 passes into threaded engagement with the support 46. The downward movement of the folder 3 base plate Si is arrested by the upper end of the slide plate 53.

Stationary shear blades 55, 55' are held in properly spaced-apart relation in the folder support [5 by blade clamps 55 and 55 and a clamp screw 51. The screw 57 passes freely through a clearance aperture in the clamp '56 and is threaded in the clamp 56. Movable shear blades 53, 5B cooperate with the stationary shear blades 55, 55, to cut a fabric strip of predetermined width. The movable shear blades are given downward cutting movements by blade carriers 59, 59' carried-by a rock-shaft rotatably and slidably mounted in a bearing 6 l inthe support l5. The blindstitch sewing machine H is also equipped with a front top feed dog 55 for feeding the fabric between the shear blades and through thefolder. The feed arm 56 of the sewing machine llactuates the front top feed dog'65.

Asshownin Figure 4, the block 38 has an openingAl of larger size than the diameter of the clamp screw 57. The large opening'permits adjustment to be made of the block 38 andof the pivotally mounted folder It to bring the rear endxof theJfolder close to the needle.

The carrier 59 is slidable on the shaft 60. The carrier 59 is fixed to the shaft 55.. Aclamp E9 is fixed to the shaft 50. An elongated key 6! is fixed to the clamp 69-and to the carrier 59. The key 61 is below and clear of the shaft 6%}. The carrier 4 59 of the blade 58 is resiliently pressed by a coil spring 68 and causes the blade to press against the stationary blade 55. The spring pressure against the clamp 69 moves the shaft 60 which carries the attached carrier 59 and the blade 58' against the stationary blade 55. The spring 68 reacts against the clamp 69 and against the carrier 59 and forces both carriers and both movable blades in direction of the stationary blades. A screw 59 secures the carrier 59' to the shaft 60.

Referring to Figure 8, it will be noted that I have provided additional mechanism for feeding a fabric tape in into the belt loop. The mechanism comprises a narrow opening H in the front portion of the front top feed-dog 65. The opening H is positioned centrally of the folder and serves for feeding the tape through the folder. The tape is fed from a spool (not shown) above the base of the sewing machine.

The tape passes below the top feed-dog 65 through the folder and to the needle and is stitched within the belt loop. The. tape is concealed inside the belt loop. The tape forms a continuous fabric strip extending from one belt loop to another. The tape serves to stiffen and flatten belt loops made of thin fabric.

I provide a wire spring 12 which is suitably secured at one end to the front top feed-dog 65 and having its free end 13 bent in U-shaped form and resting on the top feed-dog 65. The spring l2 retains the tape 10 in alinement with the opening ll during the up' and down movements of the feed-dog '65.

An extension feed bracket 15 is secured to the sewing machine feed-bar t5 whichis given fourmotion feeding movements through a mechanism (not shown) but which is well known in the. art.

The front top feed-dog 65 is pivotally mounted on a screw 83 passing through the forward portion 3% of the extension feed bracket 15. The front top feed-dog (55 is secured to a carrier 82 which is pivotally mounted on the screw 83. A spring 85 is secured at one end by a screw 86 against the feed bracket 15 and is in'tensioned engagement at the other. end against the carrier 82. The. spring 85 presses the front top feed-dog 65 against the upper surface of the folder base plate 5|.

In accordance with the patent statutes I have described and illustrated the preferred embodiment of my invention, but it will be understood that various changes'and modifications can be made therein without departing from the spirit of the invention as defined by the appended claims.

I claim:

1. In a blindstitch belt loop sewing machine having a needle and a nod former, a' folder having two inwardly curved side edges for equally folding both side edges of the belt loop strip above the strip and toward each other in abutting relation, a support therefor, the front end portion of said folder being pivoted on said support to permit said node former to rais the rear end portion of said folder during each stitching operation, the lower face of said folder at the rear end thereof having an'op-ening whereby said node former can enter directly into said'folder, said folder having its outlet end portion directly in front of said needle and in far spaced apai-t-reIation from said-pivot, said pivot being positioned in alignment with the line of stitchingQsaid folder having two inwardly curved side walls for equally folding both side edges of a belt loop strip above said strip and toward each other, said folder having an upwardly raised portion centrally thereof and in alignment with said bottom opening, forming a cavity in the belt 100p material into which said node former enters to allow said needle to partly penetrate the top surface of the belt loop material.

2. In a blindstitch belt loop sewing machine having a frame, a curved needle, an oscillating node forming means and a bracket; a folder for folding two side edges of a strip of fabric into belt loop form, a support for said folder, the front end of said folder being pivoted on said support to cause the rear end thereof to swing up and down during all the stitching operations, said folder having its outlet end portion directly in front of said needle, said pivot being positioned in alignment with the line of stitching, said folder having two inwardly curved side walls for equally folding both side edges of said strip above said strip and toward each other in abutting relation, said curved side Walls having outwardly curved extension at the outlet end of said folder for folding said fabric outwardly into concealment in said belt loop, said folder having a rearwardly converging passage, said folder having an opening centrally thereof at its lower rear portion, said lower central opening permitting entrance into said folder of means for automatically moving said folder upwardly, the rear end of said folder being movably mounted on said support, a spring having one end secured to said support and the other end secured to said outlet end portion of said folder, causing said folder to be resiliently urged downwardly, an adjusting plate having a slot therein and being slidably mounted at the rear face of said support and contacting the lower rear surface of said folder, and a threaded means threaded in said support and passing through said slot for vertically adjusting said plate for limiting the downward movements of said folder by said spring.

JOSEPH GALKIN.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 598,353 Woodward Feb. 1, 1898 1,123,096 Rathburn Dec. 29, 1914 1,448,731 Dearborn Mar. 20, 1923 1,574,524 Weis Feb. 23, 1926 1,726,448 Mueller Aug. 27, 1929 1,836,742 Auerbach Dec. 15, 1931 1,986,363 Sailer Jan. 1, 1935 2,262,547 Galkin Nov. 11, 1941 2,313,261 Podgorny Mar. 9, 1943 

